はじめに

Debian8にPHPを標準インストール
親記事：PHP, PHP-FPMの各種インストール方法とEOLまとめ

LOG

インストール

# cat /etc/os-release
PRETTY_NAME="Debian GNU/Linux 8 (jessie)"
NAME="Debian GNU/Linux"
VERSION_ID="8"
VERSION="8 (jessie)"
ID=debian
HOME_URL="http://www.debian.org/"
SUPPORT_URL="http://www.debian.org/support"
BUG_REPORT_URL="https://bugs.debian.org/"

# apt update;apt install -y php5
... 略

各種確認

# which php
/usr/bin/php

# php -v
PHP 5.6.40-0+deb8u6 (cli) (built: Sep 15 2019 11:18:30)
Copyright (c) 1997-2016 The PHP Group
Zend Engine v2.6.0, Copyright (c) 1998-2016 Zend Technologies
    with Zend OPcache v7.0.6-dev, Copyright (c) 1999-2016, by Zend Technologies

# php -i | grep php.ini
Configuration File (php.ini) Path => /etc/php5/cli
Loaded Configuration File => /etc/php5/cli/php.ini

# apt show php5
Package: php5
Version: 5.6.40+dfsg-0+deb8u6
Installed-Size: 29.7 kB
Maintainer: Debian PHP Maintainers <pkg-php-maint@lists.alioth.debian.org>
Depends: libapache2-mod-php5 (>= 5.6.40+dfsg-0+deb8u6~) | libapache2-mod-php5filter (>= 5.6.40+dfsg-0+deb8u6~) | php5-cgi (>= 5.6.40+dfsg-0+deb8u6~) | php5-fpm (>= 5.6.40+dfsg-0+deb8u6~), php5-common (>= 5.6.40+dfsg-0+deb8u6~)
Homepage: https://secure.php.net/
Section: php
Priority: optional
Download-Size: 1304 B
APT-Manual-Installed: yes
APT-Sources: http://security.debian.org/debian-security/ jessie/updates/main amd64 Packages
Description: server-side, HTML-embedded scripting language (metapackage)

N: There is 1 additional record. Please use the '-a' switch to see it

# apt show php5 -a
Package: php5
Version: 5.6.40+dfsg-0+deb8u6
Installed-Size: 29.7 kB
Maintainer: Debian PHP Maintainers <pkg-php-maint@lists.alioth.debian.org>
Depends: libapache2-mod-php5 (>= 5.6.40+dfsg-0+deb8u6~) | libapache2-mod-php5filter (>= 5.6.40+dfsg-0+deb8u6~) | php5-cgi (>= 5.6.40+dfsg-0+deb8u6~) | php5-fpm (>= 5.6.40+dfsg-0+deb8u6~), php5-common (>= 5.6.40+dfsg-0+deb8u6~)
Homepage: https://secure.php.net/
Section: php
Priority: optional
Download-Size: 1304 B
APT-Manual-Installed: yes
APT-Sources: http://security.debian.org/debian-security/ jessie/updates/main amd64 Packages
Description: server-side, HTML-embedded scripting language (metapackage)

Package: php5
Version: 5.6.33+dfsg-0+deb8u1
Installed-Size: 29.7 kB
Maintainer: Debian PHP Maintainers <pkg-php-maint@lists.alioth.debian.org>
Depends: libapache2-mod-php5 (>= 5.6.33+dfsg-0+deb8u1~) | libapache2-mod-php5filter (>= 5.6.33+dfsg-0+deb8u1~) | php5-cgi (>= 5.6.33+dfsg-0+deb8u1~) | php5-fpm (>= 5.6.33+dfsg-0+deb8u1~), php5-common (>= 5.6.33+dfsg-0+deb8u1~)
Homepage: https://secure.php.net/
Tag: devel::lang:php, devel::runtime, implemented-in::c, protocol::http,
 role::metapackage, secteam::squeeze-limited-support,
 secteam::wheezy-limited-support, web::scripting
Section: php
Priority: optional
Download-Size: 1314 B
APT-Sources: http://deb.debian.org/debian/ jessie/main amd64 Packages
Description: server-side, HTML-embedded scripting language (metapackage)